Condensed Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 741,627	$ 632,784
Accounts receivable, net	28,097	22,685
Deferred income taxes	9,643	9,643
Prepaid expenses and other current assets	76,706	66,029
Total current assets	856,073	731,141
Property and equipment:
Flight equipment	422,617	204,462
Ground and other equipment	60,860	57,012
Less accumulated depreciation	(41,472)	(36,099)
Total property and equipment	442,005	225,375
Deposits on flight equipment purchase contracts	260,334	242,881
Aircraft maintenance deposits	212,786	213,147
Deferred heavy maintenance, net	115,584	123,108
Other long-term assets	69,074	66,744
Total assets	1,955,856	1,602,396
Current liabilities:
Accounts payable	13,835	13,402
Air traffic liability	259,404	188,870
Current maturities of long-term debt	22,184	10,431
Other current liabilities	190,874	152,921
Total current liabilities	486,297	365,624
Long-term debt, less current maturities	302,800	135,232
Long-term deferred income taxes	69,510	76,010
Deferred gains and other long-term liabilities	27,832	22,455
Shareholders’ equity:
Common stock	7	7
Additional paid-in-capital	536,050	526,173
Treasury stock, at cost	(14,864)	(3,921)
Retained earnings	550,536	481,534
Accumulated other comprehensive loss	(2,312)	(718)
Total shareholders’ equity	1,069,417	1,003,075
Total liabilities and shareholders’ equity	$ 1,955,856	$ 1,602,396